Plier type stapling machine



Jan. '21, 1936. F. POLZER 2,028,350

PLIER TYPE STAPLING MACHINE Filed Nov. 1 o, 1934 2 Sheets-Sheet 1 ATTORNEYS,

Jan. 21, 1936. F. POLZER 2,028,350

' P'LIER TYPE STAPLING MACHINE I Filed Ndv. 10; 1954 2 sheets-sheet 2' I ATI'ORNEYS.

Patented Jan. 21, i936 PATENT OFFICE rnma 'rrrn s'rnrnmo moms Fridolin Polzer; South Norwalk, Conn.

Application November 10, 1934, Serial No. 752,491

8 Claim.

This invention relates to new and useful improvements in stapling machines and has particular relation to a plier type stapling machine of the ,kind used for stapling together various ar- 5 ticles, such for example as sheets of paper and the like.

An object of the invention is to provide a stapling machine of the character stated which includesimproved features of construction whereby the machine has long useful life.

Otherobjects and advantages will become apparent from a consideration of the following detailed description taken in connection with the accompanying drawings wherein a satisfactory embodiment of the invention is shown. However, it will be understood that the invention is not'limited to the details disclosed but includes all such variations and modifications as fall within the spirit of the invention and the scope of the appended claims.

In the drawings:--

Fig. 1 is a side elevational'view with parts broken away, showing the improved machine withof the parts during the final clinching of a staple; I

Fig. 5 is a sectional view taken substantially 3;, along the line 55 of Fig. 2; I

Fig, 6 is a side elevational view with parts broken away showing the head portion of the staple supporting housing;

Fig. 7 is a sectional view taken along the line 1-1 of Fig. 6;

Fig. 8 is a side elevational view showing on an enlarged scale the two parts of the head of Fig. 6 before assembly;

Fig. 9 is a top plan view of the head of the staple supporting housing; and

Fig. 10 is a perspective view of a plunger employed.

Referring in detail to the drawings, the improved stapling machine as shown includes a 50 main housing or body l comprising side walls and 12,- a top wall l3 and a bottom wall ll. This housing l0 may be a die casting as shown or may bemade up of sheetmetal or the like as desired. The side walls, H and 82 of the housing 55 IO are cutaway -to provid e a mouth or notch i opening inwardly from the machine and into which papers or the like 83 (Fig. 4) to bestapled together, may be inserted. Disposed on the bottom wall H of the housing at the lower side of the notch I5 is an anvil bar l6 secured in place 5 as by means of screws or the like II. In its upper side adjacent its forward end the bar I6 is provided with anvil recesses "I which bend or fold the prongs of staples against the underside of the papers being stapled and thus clinch the staples in the usual manner after their prongs have been forced through the papers.

Disposed within the main housing In is a piv-, oted or movable staple supporting housing or magazine generally designated l9. This house ing l9 may also beformed as a die casting and includes an elongated hollow body at its forward end provided with an upward extension 2| comprising a portion of a head generally designated 22. Within the elongated body 20 is a 20 staple guide bar 23 generally U'-sha-ped in trans-' verse section as best shown in Fig. 7, and arranged to be straddled by a strip of staples 62, which staples are to be fed to the head 22 and driven therefrom one at a time as will later ap- 2 pear. At the forward end of the guide bar 23 there is arranged a shear block 24, and the housing 20 includes a top wall 25 spaced above the upper edges of the guide bar a distance sufllcient to permit of the passage of the connecting portion of a staple, as will be understood.

The upward extension 2l at the forward end of the elongated body "is closed at its forward side as by a-wall 26' and through its rear side is provided with a slot 21. Intermediate its forward and rear sides it is provided with a pair of vertically extending dividing or partitioning pieces 28v projecting toward one another but havingtheir adjacent vertical edges spaced apart as shown best in Fig. 9. The partitioning extensions 28 together with the rear or inner wall 29of the extension 2| provide a vertical guideway 30 in which is operable a plunger 3|. This plunger comprises a blade-like body 32 bifurcated in its lower portion or provided with a slot 33 and hav- 45 ing an opening 34' in its upper portion. If desired, the upper portion of the body. 32 may be reenforced or stiifened as by securing thereto a relatively heavy plate 35 which plate as here shown is secured-to the body 32 by a rivet 3i. 5

The thickness of the upper portion of the plunger 3| is equal to the width of the guideway 30, so that the plunger is vertically movable in the guideway but has no other loose movement therein.

The staple guide bar 23' extends beyond the forward end of the elongated body 28 as shown best in Fig. 8, and the forward or outer face of the shear block 24 is flush with the inner or rear wall of the guideway 30. At'the lower side of its forward end the guide bar is provided with a depending lip 31 and above the projecting forward end portion of the guide bar the side walls of the housing I9 are recessed as at 38 and an opening 39 is provided through the housing. A

removable part or block 48 receives the projecting forward end of the staple guide bar 23 and comprises the lower portion of the head 22, and this part 48 includes a bottom wall 4I, side walls 42 and 43 anda front or forward wall 44. This block 48 closes the forward end of feed passage for the staple strip on the guide bar 23 and forms ,the forward wall of the lower portion of the plunger raceway 53. If a staple should become jammed in the raceway so that it could not be otherwise removed, it can be released by removing block 40. Within the forward portion of the part 48 are a pair of spaced blocks 45 and between said blocks there is arranged a dog 48 pivoted as at 41. Screws or the like 48 together with the pivot 41 secure the blocks in'place and the screws enter from opposite sides of the part, each screw secures one block 45 and the ends of the screws do not enter into the space between the blocks. y

In its bottom wall 4| the part 48 is provided with an opening 49 shaped to receive the depending lip 31 at the forward end of the guide bar 23.

To apply the part 48 to the housing I9 the part opening 49 in the bottom wall of the part. Thereafter, a suitable securing means as the pin 5I is passed through openings 52 in the side walls of the part and through the opening 39 in the body I9. In this way the part is rigidly secured in place by the use of the one pin 5I or other means which may be removable since such pin prevents downward or outward movement of the upper portion of the part and the lip 31 enter ing the opening 49 locks the lower portion of the part against any movement outwardly relative to 5h; body I9 or to the left as viewed in Figs. 1 an When the part 48 is in place the forward surfaces of the blocks 45 are spaced slightly from the forward end or face of the shear block 24 providing a raceway 53 below the guideway 30. The

staples 62 fed along the guide bar 23 are fed one at a time into the raceway 53 below the plunger 3| and as will later be described means areprovided to operate this plunger to drive the staples through the raceway. The strip of staples placed on the guide bar 23 is forced along the same in the direction of the raceway 53 by means of a follower 54 which is shaped to straddle the guide bar and is normally urged forwardly therealong by a coil spring 55. This spring 55 surrounds a rod 56-the forward end of which is slidable in a sleeve 51 within the follower 54 and the forward end of the spring 55 bears against this sleeve. At its rear end the spring bears against a ring 58 on the bar 56 and the rear end portion of the barmaybe carried upwardly as at 59 and then forwardly as at 56 and its free end may be hooked as at 6|. This free end. of the bar is received in an opening 62a in the top wall of the elongated body 20 of the housing I 9. (See Fig. 1.)

Obviously the spring '55 acting against the fol- 'lower-54 tends to move it-forwardly along the lower mechanism may be removed by forcing the rod 56 forwardly and then moving its rear end portion upwardly to release its hooked end 6| from the opening 62a. in the housing 20. There after, it is but necessary to draw the rod 56 rearwardly and the entire follower mechanism will be removed from the housing. When a new staple strip is placed on the guide barthe follower 54 is placed over the guide bar and by forcing the rod 55 forwardly the follower is forced forwardly and the spring 55 compressed, the forward end of the rod 56 sliding through the sleeve 51 at the underside of the follower. The rod 56 is pushed forwardly until its end may be hooked in the opening 62a in the housing and this leaves the spring 55 compressed so that it is constantly urging the follower 54 forwardly along the guide bar. Forward movement of the follower 54 may be limited by a stop or lug 54a struck up from the top wall of the follower and adapted to engage a stop wall I9a in the housing or magazine l8.

The staple supporting housing I8 including the head 22 is pivotally mounted in the main housing I0 above the anvil bar I6 thereof. To this end the elongated body 28 is provided with depending ears 63 and a pin 64 passes through the side walls of the main housing I8 and through openings in said ears 63 and pivotally mounts the staple. supporting housing I9 in the main housing I8. Staple guide bar 23 is secured in the housing I9 by screws 65 and 66 of which the screw 65 may include a relatively long head to form a stop limiting. movement of the housing I9 in one direction about its pivot 64. In Fig. 2 the head screw 65 is shown as engaging the bottom wall I4 of the main housing and thereby limiting movement of the staple supporting housing relative to the main housing.

A handle 61 maybe provided by extending the bottom and side walls of the main housing as shown. A second handle 68 is provided and intermediate its ends is pivoted to the main housing. The forward end 69 of the handle 68 extends into the housing I8 between the side walls thereof and a pivot III pivotally mounts said handle on the side wall of the housing. Also, within the housing I8 is an operating member or lever II pivoted on theside walls of the said housing as by a pivot I2 passing through the lever intermediate its ends. At its forward end lever II includes the reduced portion I3 which enters the opening 34 in the upper end portion of the plunger 3|, and in its rear end portion said lever is provided with a slot I4 through which extends a pin I5 whereby the forward end of the handle 68 and the rear end of the lever II are connected by a pin and slot connection. 7

On its top wall 25 the elongated body 28 of the staple supporting housing is provided with a. curved or dish-like recess or depression 16 located slightly fowardly of the pivot 64. In the rear of its pivot I8 the handle 68 is provided with a thickened portion 'I'I having a socket I8 therein, and it will be noted that the pivot 18 of the handle is forwardly with respect to the pivot 64 of the'staple supporting housing-and that depression I6 and the socket I8 are locatedso that their centers are between the centers of the pivots 64 and 18. A cup-like member or housing 19 having a rounded end 88 is provided to enclose the spring 8|, and this member has its rounded end seated or bearing in the depression- I6 and the member is of a diameter to telescope into the socket 18. A relatively heavy spiral spring 8| is arranged between the handle 68 and the elongated body 28 of the staple supporting housing l9; and one end portion of this ,spring is located in the socket 18 of the handle and the other end portion of the spring is received'in the housing member 19.

The parts are shown in their normal positions in Fig. 2 where it will be noted that the longitudinal center of the spiral spring 8| is substantially vertical, and this spring serves to maintain the parts in the normal positions in which they are shown. That is, the spring pressing upwardly'against the. handle 68 maintains the handle with-its forward end'69 lowermost, and

due to the pin and slot connection between the handle and the lever 1| the rear end of the latter is maintained lowermost and its forward end is maintained against the stop pin 82. Since the forward end of the lever II is in the opening 34 of. the plunger 3| obviouslythe plunger is normally held in a retracted position, and since the forward end of the said lever is forcing upwardly against the stop pin 82 it is exerting a lifting action on the forward end of the staple supporting housing I9 maintaining said housing in position. The housing member 18 enclosing the spring 8| supports this spring and prevents its buckling or bending sideways and thus keeps it straight.

Assuming that a staple has been fed'into the raceway and that some sheets of paper or the like P are to be stapled together, the handle 68 rocked about its pivot in the direction of the handle 61 and the initial movement of the handle 68 causes a compressing of the spring 8| and a lifting of the'forward end 69 of the handle which owing to the pin and slot connection 14 and 15 raises the rear end of the lever 1|. Therefore, this lever 'II is not exerting a lifting action on the head 22 and the spring 8| is pressing downwardly on the staple supporting housing l9 forwardly of its pivot 64 so that the staple supporting housing is rocked about its pivot 64 in a direction to carry its head 22- toward the anvil l8. This is asshown in Fig. 3.

On subsequent or further movement of the handle 68 in the direction indicated the forward end 68 of said handle continues to move upwardly and carries with it the rear or inner end of the lever 'I| so that the forward end of said lever must move downwardly. The head 22 by this time is against the documents to be stapled and cannot move downwardly further, and when the lever 1| is swung as indicated it moves the plunger 3| downwardly in the guideway 38 to have its lower end portion move through the raceway 53 and drive the staple therefrom and clinch it against the anvil.

On the handle 68 being released the spring 8| returns the parts to normal position. This is accomplished by the spring forcing the handle upwardly to carry the forward portion of the handle downwardly and thus rock the lever H in a direction to have it exert a lifting force on the head portion of the staple supporting housing I9 and return such housing to normal position in addition to retracting the plunger 3|. Fig. 4 shows the parts in their extreme position and there it will benoted that the rounded end 88 of e member 19 has rocked on its seat in the way and a plunger operable to drive a staple depression 16 so that the force compressing the spring 8| is in the direction of the longitudinal axis of the spring as the housing member 19 keeps the spring straight, and pressure of the spring is further to the left or forwardly of pivot 64 than when the parts are in the position of Fig. 1, so that the effective leverage of the spring on member I9 increases as the operating lever 68 moves downwardly. L

From the foregoing it will be understood that the spring is always straight and is compressed or expands always in the direction of its longitudinal axis and its efiective leverage increases as it is compressed. The spring acts to throw the staple supporting housing l9 downwardly to move its head 22 in the direction of the anvil, and the spring also serves to return the handle 68 and the other operating parts to their normal positions. For its entire length the spring is enclosed by the member I9 and the walls of the socket I8 I so that the spring is prevented from bending, and is held straight and its onlymovement must be' in the direction of its length. The rounded end 80 of the .member 19 may rock or slide in the depression 16, and this shifting of the member 25 results in a shifting of the lower end of the spring so that the spring is always in a position where its'action is in the direction of its axis.

The shear block is slotted or recessed in, its forward edge as at 83 to accommodate the pawl or dog 46 in certain of its movements. The purpose of this dig is to prevent a second staple from entering the raceway 53 until the first staple to enter the raceway has been driven therefrom. When a. staple is in the raceway below the lever of the top of the shear block 24 the connecting bar of the staple engages the front 4 edge of the lower arm of 'the dog 46 and swings it from the position of Fig. 2 to that of Fig. 4 so that the upper lug portion 46a. engages the forward staple of the strip still on the guide bar and prevents another staple entering the raceway until the first staple has been'forced from, the raceway. This dog or pawl 46 constitutes a safety feature to prevent clogging of the machine and is fully disclosed and claimed in my prior Patent 1,829,537 issued October 27, 1931.

Having thus set forth the nature of my invention, what I claim is: L

1. In a pliertype stapling machine, a housing, a handle pivoted to said housing,- a staple supporting housing pivotally mounted in the first housing and having a head provided with a raceway and a plunger operable to drive a staple therethrough, an anvil on the first housing below the raceway, a connection between the handle and plunger, a spiral spring between the handle and the staple supporting housing, a cuplike member embracing one end of the spring and having a pivot bearing on the housing, said spring adapted on movement of the handle to rock the staple supporting housing on its pivot to move its head toward the anvil, and said handl'e on further movement adapted to operate the plunger to drive a staple.

2. In a plier type stapling machine, a housing, a handle pivoted to said housing, a staple supporting housingpivotally mounted in the first housing and having a head provided with a racetherethrough, an anvil on the first housing below the raceway, a connection between the handle and plunger, a spiral spring between the handle and the staple supporting housing, a cup-like member embracing one end of the spring and having a rounded end forming a pivot bearing on the housing, said spring adapted on movement of the handle to rock the staple supporting housing on its pivot to move its head toward the anvil. said handle on further movement adapted to operate the plunger to drive a staple. and said spiral spring operable to return the parts to normal position on said handle being released.

.3. In a plier type'stapling machine, a housing,

a handle pivoted to said housing and having a socket, a staple supporting housing pivotally mounted in the first housing and at its forward end having a head provided with a raceway and a plunger operable to drive staples therethrough, an anvil supported by the first housing below the raceway, said staple supporting housing having a rounded depression in its upper side, a

cup-like member having a rounded end resting 4. In a staple driving machine, a staple supporting housing comprising an elongated hollow body, a guide bar in said body and extending through the forward end thereof, the forward end portion of said .body including a guideway forwardlyof the forward end of the guide bar, a staple driving plunger in the guideway, a removable blockrigid with the housing and cooperating with the forward end of the guide bar to provide a raceway below the guideway, means locking this block against longitudinal movement away from the bar, comprising interengaging shoulders on the parand the block, means to feed staples along the guide bar to the raceway, and means .to operate the" plunger to drive the staples through the raceway.

*5. In a staple driving machine, a staple supporting housing comprising an elongated hollow body, a guide bar in said body and extending through the forward end thereof, the forward end portion of said body including a guideway forwardly of the forward end of the guidebar, a staple driving plunger in the guideway, said guide bar having a depending lip at the underr side of its forward end, a removable part secured to said housing and including a lower wall having a recess receiving said lip, a pair of upwardly extending side walls engaging side wall portions of the housing, means securing said sidewalls to the housing, anda portion cooperating with the forward end of the guide bar to provide a raceway below the guideway, means to feed staples operate the plunger to drive the staples through the raceway. v

6. In a plier type stapling machine, a housing, a handle pivoted to said housing and having a socket therein, a staple supporting housing pivotally mounted in the first housing and at its forward end having a head provided with a raceway and a plunger operable to drive staples therethrough, an anvil supported by the first housing below the raceway, said staple supporting housing having a. rounded depression in its upper side, a member having a rounded and resting and rockable in said depression, a spiral spring having one end receiving in the socket in the handle and its other and bearing against said member, said spring adapted on movement of the handle to rock the staple supporting housing on its pivot to move its head toward the anvil, and a connection between the handle and plunger whereby on further movement of the handle the plunger-is operated to drive a staple.

'I. In a plier type stapling machine, a housing, a handle pivoted to said housing and having a socket rearwardly of its pivot, a staple supporting housing pivotally mounted in the first housing and at its forward end having a head provided with a raceway and a plunger operable to drive staples therethrough, an anvil supported by the first housing below the raceway, said staple supporting housing having a rounded depression in its upper side forwardly of its pivot, a cup-like member extending partly into said socket and having a rounded end resting in said depression, a spiral springhaving its respectiveends received in the cup-like member and the socket in the handle, said spring adapted on movement .of the forwardly of the forward end of the guide bar, a

staple driving plunger in the guideway, a removable .block rigid ing with the forward end of the guide bar to provide a raceway below the guideway, a spring pressed follower for feeding staples along the guidebar to the raceway, said block having an upright recess, and a dog pivoted in the recess shaped at its upper end to adapt it to engage the first staple of a strip on the bar and shaped below the pivot to be held in this position by a staple in the raceway to prevent a second staple entering the raceway while there is a staple therein.

FRJDOLIN POLZER.

with the housing and cooperat 

